Taylor Swift's new single "I Knew It, I Knew You," written for an upcoming Pixar/Disney animated feature, debuted at number one on the Billboard Hot 100 the week of September 5, 2026. The post would explore how a soundtrack cut became her chart-topper, breaking down the songwriting partnership with Jack Antonoff and comparing it to her other recent number-ones like "The Fate of Ophelia" and "Opalite." It would also touch on what this means for the film's marketing push heading into release. A section could cover fan reactions and early theories about the film's plot based on lyrics.